DTC Troubleshooting: U0155 (126)
DTC U0155:
 F-CAN Malfunction (ECM/PCM Gauge Control Module)
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0155 indicated?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module and the ECM/PCM.■
  1. Check for body electrical DTCs in the DTCs MENU with the HDS.
Is DTC B1168, B1169, and/or B1178 indicated?
YES -
Go to Step 5 .
NO -
Do the gauge control module input test. ■
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Remove the gauge control module.
  1. Disconnect the gauge control module 32P connector.
  1. Disconnect ECM/PCM connector A (44P).
  1. Connect gauge control module 32P connector terminal No. 22 to body ground with a jumper wire.